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erofs: clean up z_erofs_submit_queue()

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A label and extra variables will be eliminated,
which is more cleaner.

Link: https://lore.kernel.org/r/20200121064819.139469-1-gaoxiang25@huawei.com
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
This commit is contained in:
Gao Xiang 2020-01-21 14:48:19 +08:00
parent 587a67b777
commit 1e4a295567
1 changed files with 40 additions and 55 deletions
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95
fs/erofs/zdata.c
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@ -1148,7 +1148,7 @@ static void move_to_bypass_jobqueue(struct z_erofs_pcluster *pcl,
qtail[JQ_BYPASS] = &pcl->next;
}
static bool z_erofs_submit_queue(struct super_block *sb,
static void z_erofs_submit_queue(struct super_block *sb,
z_erofs_next_pcluster_t owned_head,
struct list_head *pagepool,
struct z_erofs_decompressqueue *fgq,
@ -1157,19 +1157,12 @@ static bool z_erofs_submit_queue(struct super_block *sb,
struct erofs_sb_info *const sbi = EROFS_SB(sb);
z_erofs_next_pcluster_t qtail[NR_JOBQUEUES];
struct z_erofs_decompressqueue *q[NR_JOBQUEUES];
struct bio *bio;
void *bi_private;
/* since bio will be NULL, no need to initialize last_index */
pgoff_t uninitialized_var(last_index);
bool force_submit = false;
unsigned int nr_bios;
unsigned int nr_bios = 0;
struct bio *bio = NULL;
if (owned_head == Z_EROFS_PCLUSTER_TAIL)
return false;
force_submit = false;
bio = NULL;
nr_bios = 0;
bi_private = jobqueueset_init(sb, q, fgq, force_fg);
qtail[JQ_BYPASS] = &q[JQ_BYPASS]->head;
qtail[JQ_SUBMIT] = &q[JQ_SUBMIT]->head;
@ -1179,11 +1172,9 @@ static bool z_erofs_submit_queue(struct super_block *sb,
do {
struct z_erofs_pcluster *pcl;
unsigned int clusterpages;
pgoff_t first_index;
struct page *page;
unsigned int i = 0, bypass = 0;
int err;
pgoff_t cur, end;
unsigned int i = 0;
bool bypass = true;
/* no possible 'owned_head' equals the following */
DBG_BUGON(owned_head == Z_EROFS_PCLUSTER_TAIL_CLOSED);
@ -1191,55 +1182,50 @@ static bool z_erofs_submit_queue(struct super_block *sb,
pcl = container_of(owned_head, struct z_erofs_pcluster, next);
clusterpages = BIT(pcl->clusterbits);
cur = pcl->obj.index;
end = cur + BIT(pcl->clusterbits);
/* close the main owned chain at first */
owned_head = cmpxchg(&pcl->next, Z_EROFS_PCLUSTER_TAIL,
Z_EROFS_PCLUSTER_TAIL_CLOSED);
first_index = pcl->obj.index;
force_submit |= (first_index != last_index + 1);
do {
struct page *page;
int err;
repeat:
page = pickup_page_for_submission(pcl, i, pagepool,
MNGD_MAPPING(sbi),
GFP_NOFS);
if (!page) {
force_submit = true;
++bypass;
goto skippage;
}
page = pickup_page_for_submission(pcl, i++, pagepool,
MNGD_MAPPING(sbi),
GFP_NOFS);
if (!page)
continue;
if (bio && force_submit) {
if (bio && cur != last_index + 1) {
submit_bio_retry:
submit_bio(bio);
bio = NULL;
}
submit_bio(bio);
bio = NULL;
}
if (!bio) {
bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
if (!bio) {
bio = bio_alloc(GFP_NOIO, BIO_MAX_PAGES);
bio->bi_end_io = z_erofs_decompressqueue_endio;
bio_set_dev(bio, sb->s_bdev);
bio->bi_iter.bi_sector = (sector_t)(first_index + i) <<
LOG_SECTORS_PER_BLOCK;
bio->bi_private = bi_private;
bio->bi_opf = REQ_OP_READ;
bio->bi_end_io = z_erofs_decompressqueue_endio;
bio_set_dev(bio, sb->s_bdev);
bio->bi_iter.bi_sector = (sector_t)cur <<
LOG_SECTORS_PER_BLOCK;
bio->bi_private = bi_private;
bio->bi_opf = REQ_OP_READ;
++nr_bios;
}
++nr_bios;
}
err = bio_add_page(bio, page, PAGE_SIZE, 0);
if (err < PAGE_SIZE)
goto submit_bio_retry;
err = bio_add_page(bio, page, PAGE_SIZE, 0);
if (err < PAGE_SIZE)
goto submit_bio_retry;
last_index = cur;
bypass = false;
} while (++cur < end);
force_submit = false;
last_index = first_index + i;
skippage:
if (++i < clusterpages)
goto repeat;
if (bypass < clusterpages)
if (!bypass)
qtail[JQ_SUBMIT] = &pcl->next;
else
move_to_bypass_jobqueue(pcl, qtail, owned_head);
@ -1254,10 +1240,9 @@ skippage:
*/
if (!*force_fg && !nr_bios) {
kvfree(q[JQ_SUBMIT]);
return true;
return;
}
z_erofs_decompress_kickoff(q[JQ_SUBMIT], *force_fg, nr_bios);
return true;
}
static void z_erofs_runqueue(struct super_block *sb,
@ -1266,9 +1251,9 @@ static void z_erofs_runqueue(struct super_block *sb,
{
struct z_erofs_decompressqueue io[NR_JOBQUEUES];
if (!z_erofs_submit_queue(sb, clt->owned_head,
pagepool, io, &force_fg))
if (clt->owned_head == Z_EROFS_PCLUSTER_TAIL)
return;
z_erofs_submit_queue(sb, clt->owned_head, pagepool, io, &force_fg);
/* handle bypass queue (no i/o pclusters) immediately */
z_erofs_decompress_queue(&io[JQ_BYPASS], pagepool);